6. (5x*y+ 4x³y³) dx + (3x³ + 5x*y²) dy = 0 7. 3y4 dx + (4xy³ + 5x¯2y+) dy = 0 8. (2xy? + y + 2xy cos x?) dx + (2 sin x² + 3x²y + 2x) dy = 0 9. y" – 2y' – 3y = -t – 3e-2t 10. y" – y' – 6y = 2e¬t – t |

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